4 * Written 1992,1993 by Werner Almesberger
5 * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
6 * Rewritten for the constant inumbers support by Al Viro
10 * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/time.h>
16 #include <linux/slab.h>
17 #include <linux/smp_lock.h>
18 #include <linux/seq_file.h>
19 #include <linux/msdos_fs.h>
20 #include <linux/pagemap.h>
21 #include <linux/mpage.h>
22 #include <linux/buffer_head.h>
23 #include <linux/mount.h>
24 #include <linux/vfs.h>
25 #include <linux/parser.h>
26 #include <linux/uio.h>
27 #include <linux/writeback.h>
28 #include <asm/unaligned.h>
30 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
31 /* if user don't select VFAT, this is undefined. */
32 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
35 static int fat_default_codepage
= CONFIG_FAT_DEFAULT_CODEPAGE
;
36 static char fat_default_iocharset
[] = CONFIG_FAT_DEFAULT_IOCHARSET
;
39 static int fat_add_cluster(struct inode
*inode
)
43 err
= fat_alloc_clusters(inode
, &cluster
, 1);
46 /* FIXME: this cluster should be added after data of this
47 * cluster is writed */
48 err
= fat_chain_add(inode
, cluster
, 1);
50 fat_free_clusters(inode
, cluster
);
54 static inline int __fat_get_block(struct inode
*inode
, sector_t iblock
,
55 unsigned long *max_blocks
,
56 struct buffer_head
*bh_result
, int create
)
58 struct super_block
*sb
= inode
->i_sb
;
59 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
60 unsigned long mapped_blocks
;
64 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
);
68 map_bh(bh_result
, sb
, phys
);
69 *max_blocks
= min(mapped_blocks
, *max_blocks
);
75 if (iblock
!= MSDOS_I(inode
)->mmu_private
>> sb
->s_blocksize_bits
) {
76 fat_fs_panic(sb
, "corrupted file size (i_pos %lld, %lld)",
77 MSDOS_I(inode
)->i_pos
, MSDOS_I(inode
)->mmu_private
);
81 offset
= (unsigned long)iblock
& (sbi
->sec_per_clus
- 1);
83 /* TODO: multiple cluster allocation would be desirable. */
84 err
= fat_add_cluster(inode
);
88 /* available blocks on this cluster */
89 mapped_blocks
= sbi
->sec_per_clus
- offset
;
91 *max_blocks
= min(mapped_blocks
, *max_blocks
);
92 MSDOS_I(inode
)->mmu_private
+= *max_blocks
<< sb
->s_blocksize_bits
;
94 err
= fat_bmap(inode
, iblock
, &phys
, &mapped_blocks
);
99 BUG_ON(*max_blocks
!= mapped_blocks
);
100 set_buffer_new(bh_result
);
101 map_bh(bh_result
, sb
, phys
);
106 static int fat_get_block(struct inode
*inode
, sector_t iblock
,
107 struct buffer_head
*bh_result
, int create
)
109 struct super_block
*sb
= inode
->i_sb
;
110 unsigned long max_blocks
= bh_result
->b_size
>> inode
->i_blkbits
;
113 err
= __fat_get_block(inode
, iblock
, &max_blocks
, bh_result
, create
);
116 bh_result
->b_size
= max_blocks
<< sb
->s_blocksize_bits
;
120 static int fat_writepage(struct page
*page
, struct writeback_control
*wbc
)
122 return block_write_full_page(page
, fat_get_block
, wbc
);
125 static int fat_writepages(struct address_space
*mapping
,
126 struct writeback_control
*wbc
)
128 return mpage_writepages(mapping
, wbc
, fat_get_block
);
131 static int fat_readpage(struct file
*file
, struct page
*page
)
133 return mpage_readpage(page
, fat_get_block
);
136 static int fat_readpages(struct file
*file
, struct address_space
*mapping
,
137 struct list_head
*pages
, unsigned nr_pages
)
139 return mpage_readpages(mapping
, pages
, nr_pages
, fat_get_block
);
142 static int fat_prepare_write(struct file
*file
, struct page
*page
,
143 unsigned from
, unsigned to
)
145 return cont_prepare_write(page
, from
, to
, fat_get_block
,
146 &MSDOS_I(page
->mapping
->host
)->mmu_private
);
149 static int fat_commit_write(struct file
*file
, struct page
*page
,
150 unsigned from
, unsigned to
)
152 struct inode
*inode
= page
->mapping
->host
;
153 int err
= generic_commit_write(file
, page
, from
, to
);
154 if (!err
&& !(MSDOS_I(inode
)->i_attrs
& ATTR_ARCH
)) {
155 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME_SEC
;
156 MSDOS_I(inode
)->i_attrs
|= ATTR_ARCH
;
157 mark_inode_dirty(inode
);
162 static ssize_t
fat_direct_IO(int rw
, struct kiocb
*iocb
,
163 const struct iovec
*iov
,
164 loff_t offset
, unsigned long nr_segs
)
166 struct file
*file
= iocb
->ki_filp
;
167 struct inode
*inode
= file
->f_mapping
->host
;
171 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
172 * so we need to update the ->mmu_private to block boundary.
174 * But we must fill the remaining area or hole by nul for
175 * updating ->mmu_private.
177 * Return 0, and fallback to normal buffered write.
179 loff_t size
= offset
+ iov_length(iov
, nr_segs
);
180 if (MSDOS_I(inode
)->mmu_private
< size
)
185 * FAT need to use the DIO_LOCKING for avoiding the race
186 * condition of fat_get_block() and ->truncate().
188 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
189 offset
, nr_segs
, fat_get_block
, NULL
);
192 static sector_t
_fat_bmap(struct address_space
*mapping
, sector_t block
)
194 return generic_block_bmap(mapping
, block
, fat_get_block
);
197 static const struct address_space_operations fat_aops
= {
198 .readpage
= fat_readpage
,
199 .readpages
= fat_readpages
,
200 .writepage
= fat_writepage
,
201 .writepages
= fat_writepages
,
202 .sync_page
= block_sync_page
,
203 .prepare_write
= fat_prepare_write
,
204 .commit_write
= fat_commit_write
,
205 .direct_IO
= fat_direct_IO
,
210 * New FAT inode stuff. We do the following:
211 * a) i_ino is constant and has nothing with on-disk location.
212 * b) FAT manages its own cache of directory entries.
213 * c) *This* cache is indexed by on-disk location.
214 * d) inode has an associated directory entry, all right, but
215 * it may be unhashed.
216 * e) currently entries are stored within struct inode. That should
218 * f) we deal with races in the following way:
219 * 1. readdir() and lookup() do FAT-dir-cache lookup.
220 * 2. rename() unhashes the F-d-c entry and rehashes it in
222 * 3. unlink() and rmdir() unhash F-d-c entry.
223 * 4. fat_write_inode() checks whether the thing is unhashed.
224 * If it is we silently return. If it isn't we do bread(),
225 * check if the location is still valid and retry if it
226 * isn't. Otherwise we do changes.
227 * 5. Spinlock is used to protect hash/unhash/location check/lookup
228 * 6. fat_clear_inode() unhashes the F-d-c entry.
229 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
230 * and consider negative result as cache miss.
233 static void fat_hash_init(struct super_block
*sb
)
235 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
238 spin_lock_init(&sbi
->inode_hash_lock
);
239 for (i
= 0; i
< FAT_HASH_SIZE
; i
++)
240 INIT_HLIST_HEAD(&sbi
->inode_hashtable
[i
]);
243 static inline unsigned long fat_hash(struct super_block
*sb
, loff_t i_pos
)
245 unsigned long tmp
= (unsigned long)i_pos
| (unsigned long) sb
;
246 tmp
= tmp
+ (tmp
>> FAT_HASH_BITS
) + (tmp
>> FAT_HASH_BITS
* 2);
247 return tmp
& FAT_HASH_MASK
;
250 void fat_attach(struct inode
*inode
, loff_t i_pos
)
252 struct super_block
*sb
= inode
->i_sb
;
253 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
255 spin_lock(&sbi
->inode_hash_lock
);
256 MSDOS_I(inode
)->i_pos
= i_pos
;
257 hlist_add_head(&MSDOS_I(inode
)->i_fat_hash
,
258 sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
));
259 spin_unlock(&sbi
->inode_hash_lock
);
262 EXPORT_SYMBOL_GPL(fat_attach
);
264 void fat_detach(struct inode
*inode
)
266 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
267 spin_lock(&sbi
->inode_hash_lock
);
268 MSDOS_I(inode
)->i_pos
= 0;
269 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
270 spin_unlock(&sbi
->inode_hash_lock
);
273 EXPORT_SYMBOL_GPL(fat_detach
);
275 struct inode
*fat_iget(struct super_block
*sb
, loff_t i_pos
)
277 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
278 struct hlist_head
*head
= sbi
->inode_hashtable
+ fat_hash(sb
, i_pos
);
279 struct hlist_node
*_p
;
280 struct msdos_inode_info
*i
;
281 struct inode
*inode
= NULL
;
283 spin_lock(&sbi
->inode_hash_lock
);
284 hlist_for_each_entry(i
, _p
, head
, i_fat_hash
) {
285 BUG_ON(i
->vfs_inode
.i_sb
!= sb
);
286 if (i
->i_pos
!= i_pos
)
288 inode
= igrab(&i
->vfs_inode
);
292 spin_unlock(&sbi
->inode_hash_lock
);
296 static int is_exec(unsigned char *extension
)
298 unsigned char *exe_extensions
= "EXECOMBAT", *walk
;
300 for (walk
= exe_extensions
; *walk
; walk
+= 3)
301 if (!strncmp(extension
, walk
, 3))
306 static int fat_calc_dir_size(struct inode
*inode
)
308 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
309 int ret
, fclus
, dclus
;
312 if (MSDOS_I(inode
)->i_start
== 0)
315 ret
= fat_get_cluster(inode
, FAT_ENT_EOF
, &fclus
, &dclus
);
318 inode
->i_size
= (fclus
+ 1) << sbi
->cluster_bits
;
323 /* doesn't deal with root inode */
324 static int fat_fill_inode(struct inode
*inode
, struct msdos_dir_entry
*de
)
326 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
329 MSDOS_I(inode
)->i_pos
= 0;
330 inode
->i_uid
= sbi
->options
.fs_uid
;
331 inode
->i_gid
= sbi
->options
.fs_gid
;
333 inode
->i_generation
= get_seconds();
335 if ((de
->attr
& ATTR_DIR
) && !IS_FREE(de
->name
)) {
336 inode
->i_generation
&= ~1;
337 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
338 S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
339 inode
->i_op
= sbi
->dir_ops
;
340 inode
->i_fop
= &fat_dir_operations
;
342 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
343 if (sbi
->fat_bits
== 32)
344 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
346 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
347 error
= fat_calc_dir_size(inode
);
350 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
352 inode
->i_nlink
= fat_subdirs(inode
);
353 } else { /* not a directory */
354 inode
->i_generation
|= 1;
355 inode
->i_mode
= MSDOS_MKMODE(de
->attr
,
356 ((sbi
->options
.showexec
&&
358 ? S_IRUGO
|S_IWUGO
: S_IRWXUGO
)
359 & ~sbi
->options
.fs_fmask
) | S_IFREG
;
360 MSDOS_I(inode
)->i_start
= le16_to_cpu(de
->start
);
361 if (sbi
->fat_bits
== 32)
362 MSDOS_I(inode
)->i_start
|= (le16_to_cpu(de
->starthi
) << 16);
364 MSDOS_I(inode
)->i_logstart
= MSDOS_I(inode
)->i_start
;
365 inode
->i_size
= le32_to_cpu(de
->size
);
366 inode
->i_op
= &fat_file_inode_operations
;
367 inode
->i_fop
= &fat_file_operations
;
368 inode
->i_mapping
->a_ops
= &fat_aops
;
369 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
371 if (de
->attr
& ATTR_SYS
) {
372 if (sbi
->options
.sys_immutable
)
373 inode
->i_flags
|= S_IMMUTABLE
;
375 MSDOS_I(inode
)->i_attrs
= de
->attr
& ATTR_UNUSED
;
376 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
377 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
378 inode
->i_mtime
.tv_sec
=
379 date_dos2unix(le16_to_cpu(de
->time
), le16_to_cpu(de
->date
));
380 inode
->i_mtime
.tv_nsec
= 0;
381 if (sbi
->options
.isvfat
) {
382 int secs
= de
->ctime_cs
/ 100;
383 int csecs
= de
->ctime_cs
% 100;
384 inode
->i_ctime
.tv_sec
=
385 date_dos2unix(le16_to_cpu(de
->ctime
),
386 le16_to_cpu(de
->cdate
)) + secs
;
387 inode
->i_ctime
.tv_nsec
= csecs
* 10000000;
388 inode
->i_atime
.tv_sec
=
389 date_dos2unix(0, le16_to_cpu(de
->adate
));
390 inode
->i_atime
.tv_nsec
= 0;
392 inode
->i_ctime
= inode
->i_atime
= inode
->i_mtime
;
397 struct inode
*fat_build_inode(struct super_block
*sb
,
398 struct msdos_dir_entry
*de
, loff_t i_pos
)
403 inode
= fat_iget(sb
, i_pos
);
406 inode
= new_inode(sb
);
408 inode
= ERR_PTR(-ENOMEM
);
411 inode
->i_ino
= iunique(sb
, MSDOS_ROOT_INO
);
412 inode
->i_version
= 1;
413 err
= fat_fill_inode(inode
, de
);
416 inode
= ERR_PTR(err
);
419 fat_attach(inode
, i_pos
);
420 insert_inode_hash(inode
);
425 EXPORT_SYMBOL_GPL(fat_build_inode
);
427 static void fat_delete_inode(struct inode
*inode
)
429 truncate_inode_pages(&inode
->i_data
, 0);
431 if (!is_bad_inode(inode
)) {
438 static void fat_clear_inode(struct inode
*inode
)
440 struct msdos_sb_info
*sbi
= MSDOS_SB(inode
->i_sb
);
442 if (is_bad_inode(inode
))
445 spin_lock(&sbi
->inode_hash_lock
);
446 fat_cache_inval_inode(inode
);
447 hlist_del_init(&MSDOS_I(inode
)->i_fat_hash
);
448 spin_unlock(&sbi
->inode_hash_lock
);
452 static void fat_write_super(struct super_block
*sb
)
456 if (!(sb
->s_flags
& MS_RDONLY
))
457 fat_clusters_flush(sb
);
460 static void fat_put_super(struct super_block
*sb
)
462 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
465 unload_nls(sbi
->nls_disk
);
466 sbi
->nls_disk
= NULL
;
467 sbi
->options
.codepage
= fat_default_codepage
;
470 unload_nls(sbi
->nls_io
);
473 if (sbi
->options
.iocharset
!= fat_default_iocharset
) {
474 kfree(sbi
->options
.iocharset
);
475 sbi
->options
.iocharset
= fat_default_iocharset
;
478 sb
->s_fs_info
= NULL
;
482 static struct kmem_cache
*fat_inode_cachep
;
484 static struct inode
*fat_alloc_inode(struct super_block
*sb
)
486 struct msdos_inode_info
*ei
;
487 ei
= kmem_cache_alloc(fat_inode_cachep
, GFP_KERNEL
);
490 return &ei
->vfs_inode
;
493 static void fat_destroy_inode(struct inode
*inode
)
495 kmem_cache_free(fat_inode_cachep
, MSDOS_I(inode
));
498 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
500 struct msdos_inode_info
*ei
= (struct msdos_inode_info
*)foo
;
502 if (flags
& SLAB_CTOR_CONSTRUCTOR
) {
503 spin_lock_init(&ei
->cache_lru_lock
);
505 ei
->cache_valid_id
= FAT_CACHE_VALID
+ 1;
506 INIT_LIST_HEAD(&ei
->cache_lru
);
507 INIT_HLIST_NODE(&ei
->i_fat_hash
);
508 inode_init_once(&ei
->vfs_inode
);
512 static int __init
fat_init_inodecache(void)
514 fat_inode_cachep
= kmem_cache_create("fat_inode_cache",
515 sizeof(struct msdos_inode_info
),
516 0, (SLAB_RECLAIM_ACCOUNT
|
519 if (fat_inode_cachep
== NULL
)
524 static void __exit
fat_destroy_inodecache(void)
526 kmem_cache_destroy(fat_inode_cachep
);
529 static int fat_remount(struct super_block
*sb
, int *flags
, char *data
)
531 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
532 *flags
|= MS_NODIRATIME
| (sbi
->options
.isvfat
? 0 : MS_NOATIME
);
536 static int fat_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
538 struct msdos_sb_info
*sbi
= MSDOS_SB(dentry
->d_sb
);
540 /* If the count of free cluster is still unknown, counts it here. */
541 if (sbi
->free_clusters
== -1) {
542 int err
= fat_count_free_clusters(dentry
->d_sb
);
547 buf
->f_type
= dentry
->d_sb
->s_magic
;
548 buf
->f_bsize
= sbi
->cluster_size
;
549 buf
->f_blocks
= sbi
->max_cluster
- FAT_START_ENT
;
550 buf
->f_bfree
= sbi
->free_clusters
;
551 buf
->f_bavail
= sbi
->free_clusters
;
552 buf
->f_namelen
= sbi
->options
.isvfat
? 260 : 12;
557 static int fat_write_inode(struct inode
*inode
, int wait
)
559 struct super_block
*sb
= inode
->i_sb
;
560 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
561 struct buffer_head
*bh
;
562 struct msdos_dir_entry
*raw_entry
;
567 i_pos
= MSDOS_I(inode
)->i_pos
;
568 if (inode
->i_ino
== MSDOS_ROOT_INO
|| !i_pos
)
572 bh
= sb_bread(sb
, i_pos
>> sbi
->dir_per_block_bits
);
574 printk(KERN_ERR
"FAT: unable to read inode block "
575 "for updating (i_pos %lld)\n", i_pos
);
579 spin_lock(&sbi
->inode_hash_lock
);
580 if (i_pos
!= MSDOS_I(inode
)->i_pos
) {
581 spin_unlock(&sbi
->inode_hash_lock
);
587 raw_entry
= &((struct msdos_dir_entry
*) (bh
->b_data
))
588 [i_pos
& (sbi
->dir_per_block
- 1)];
589 if (S_ISDIR(inode
->i_mode
))
592 raw_entry
->size
= cpu_to_le32(inode
->i_size
);
593 raw_entry
->attr
= fat_attr(inode
);
594 raw_entry
->start
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
);
595 raw_entry
->starthi
= cpu_to_le16(MSDOS_I(inode
)->i_logstart
>> 16);
596 fat_date_unix2dos(inode
->i_mtime
.tv_sec
, &raw_entry
->time
, &raw_entry
->date
);
597 if (sbi
->options
.isvfat
) {
599 fat_date_unix2dos(inode
->i_ctime
.tv_sec
,&raw_entry
->ctime
,&raw_entry
->cdate
);
600 fat_date_unix2dos(inode
->i_atime
.tv_sec
,&atime
,&raw_entry
->adate
);
601 raw_entry
->ctime_cs
= (inode
->i_ctime
.tv_sec
& 1) * 100 +
602 inode
->i_ctime
.tv_nsec
/ 10000000;
604 spin_unlock(&sbi
->inode_hash_lock
);
605 mark_buffer_dirty(bh
);
607 err
= sync_dirty_buffer(bh
);
614 int fat_sync_inode(struct inode
*inode
)
616 return fat_write_inode(inode
, 1);
619 EXPORT_SYMBOL_GPL(fat_sync_inode
);
621 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
622 static const struct super_operations fat_sops
= {
623 .alloc_inode
= fat_alloc_inode
,
624 .destroy_inode
= fat_destroy_inode
,
625 .write_inode
= fat_write_inode
,
626 .delete_inode
= fat_delete_inode
,
627 .put_super
= fat_put_super
,
628 .write_super
= fat_write_super
,
629 .statfs
= fat_statfs
,
630 .clear_inode
= fat_clear_inode
,
631 .remount_fs
= fat_remount
,
633 .read_inode
= make_bad_inode
,
635 .show_options
= fat_show_options
,
639 * a FAT file handle with fhtype 3 is
640 * 0/ i_ino - for fast, reliable lookup if still in the cache
641 * 1/ i_generation - to see if i_ino is still valid
642 * bit 0 == 0 iff directory
643 * 2/ i_pos(8-39) - if ino has changed, but still in cache
644 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
645 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
647 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
648 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
649 * of i_logstart is used to store the directory entry offset.
652 static struct dentry
*
653 fat_decode_fh(struct super_block
*sb
, __u32
*fh
, int len
, int fhtype
,
654 int (*acceptable
)(void *context
, struct dentry
*de
),
658 return ERR_PTR(-ESTALE
);
660 return ERR_PTR(-ESTALE
);
662 return sb
->s_export_op
->find_exported_dentry(sb
, fh
, NULL
, acceptable
, context
);
665 static struct dentry
*fat_get_dentry(struct super_block
*sb
, void *inump
)
667 struct inode
*inode
= NULL
;
668 struct dentry
*result
;
671 inode
= iget(sb
, fh
[0]);
672 if (!inode
|| is_bad_inode(inode
) || inode
->i_generation
!= fh
[1]) {
679 int i_logstart
= fh
[3] & 0x0fffffff;
681 i_pos
= (loff_t
)fh
[2] << 8;
682 i_pos
|= ((fh
[3] >> 24) & 0xf0) | (fh
[4] >> 28);
684 /* try 2 - see if i_pos is in F-d-c
685 * require i_logstart to be the same
686 * Will fail if you truncate and then re-write
689 inode
= fat_iget(sb
, i_pos
);
690 if (inode
&& MSDOS_I(inode
)->i_logstart
!= i_logstart
) {
696 /* For now, do nothing
697 * What we could do is:
698 * follow the file starting at fh[4], and record
699 * the ".." entry, and the name of the fh[2] entry.
700 * The follow the ".." file finding the next step up.
701 * This way we build a path to the root of
702 * the tree. If this works, we lookup the path and so
703 * get this inode into the cache.
704 * Finally try the fat_iget lookup again
705 * If that fails, then weare totally out of luck
706 * But all that is for another day
710 return ERR_PTR(-ESTALE
);
713 /* now to find a dentry.
714 * If possible, get a well-connected one
716 result
= d_alloc_anon(inode
);
717 if (result
== NULL
) {
719 return ERR_PTR(-ENOMEM
);
721 result
->d_op
= sb
->s_root
->d_op
;
726 fat_encode_fh(struct dentry
*de
, __u32
*fh
, int *lenp
, int connectable
)
729 struct inode
*inode
= de
->d_inode
;
730 u32 ipos_h
, ipos_m
, ipos_l
;
733 return 255; /* no room */
735 ipos_h
= MSDOS_I(inode
)->i_pos
>> 8;
736 ipos_m
= (MSDOS_I(inode
)->i_pos
& 0xf0) << 24;
737 ipos_l
= (MSDOS_I(inode
)->i_pos
& 0x0f) << 28;
739 fh
[0] = inode
->i_ino
;
740 fh
[1] = inode
->i_generation
;
742 fh
[3] = ipos_m
| MSDOS_I(inode
)->i_logstart
;
743 spin_lock(&de
->d_lock
);
744 fh
[4] = ipos_l
| MSDOS_I(de
->d_parent
->d_inode
)->i_logstart
;
745 spin_unlock(&de
->d_lock
);
749 static struct dentry
*fat_get_parent(struct dentry
*child
)
751 struct buffer_head
*bh
;
752 struct msdos_dir_entry
*de
;
754 struct dentry
*parent
;
760 err
= fat_get_dotdot_entry(child
->d_inode
, &bh
, &de
, &i_pos
);
762 parent
= ERR_PTR(err
);
765 inode
= fat_build_inode(child
->d_sb
, de
, i_pos
);
768 parent
= ERR_PTR(PTR_ERR(inode
));
771 parent
= d_alloc_anon(inode
);
774 parent
= ERR_PTR(-ENOMEM
);
782 static struct export_operations fat_export_ops
= {
783 .decode_fh
= fat_decode_fh
,
784 .encode_fh
= fat_encode_fh
,
785 .get_dentry
= fat_get_dentry
,
786 .get_parent
= fat_get_parent
,
789 static int fat_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
791 struct msdos_sb_info
*sbi
= MSDOS_SB(mnt
->mnt_sb
);
792 struct fat_mount_options
*opts
= &sbi
->options
;
793 int isvfat
= opts
->isvfat
;
795 if (opts
->fs_uid
!= 0)
796 seq_printf(m
, ",uid=%u", opts
->fs_uid
);
797 if (opts
->fs_gid
!= 0)
798 seq_printf(m
, ",gid=%u", opts
->fs_gid
);
799 seq_printf(m
, ",fmask=%04o", opts
->fs_fmask
);
800 seq_printf(m
, ",dmask=%04o", opts
->fs_dmask
);
802 seq_printf(m
, ",codepage=%s", sbi
->nls_disk
->charset
);
805 seq_printf(m
, ",iocharset=%s", sbi
->nls_io
->charset
);
807 switch (opts
->shortname
) {
808 case VFAT_SFN_DISPLAY_WIN95
| VFAT_SFN_CREATE_WIN95
:
809 seq_puts(m
, ",shortname=win95");
811 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WINNT
:
812 seq_puts(m
, ",shortname=winnt");
814 case VFAT_SFN_DISPLAY_WINNT
| VFAT_SFN_CREATE_WIN95
:
815 seq_puts(m
, ",shortname=mixed");
817 case VFAT_SFN_DISPLAY_LOWER
| VFAT_SFN_CREATE_WIN95
:
818 /* seq_puts(m, ",shortname=lower"); */
821 seq_puts(m
, ",shortname=unknown");
825 if (opts
->name_check
!= 'n')
826 seq_printf(m
, ",check=%c", opts
->name_check
);
828 seq_puts(m
, ",quiet");
830 seq_puts(m
, ",showexec");
831 if (opts
->sys_immutable
)
832 seq_puts(m
, ",sys_immutable");
835 seq_puts(m
, ",dotsOK=yes");
837 seq_puts(m
, ",nocase");
840 seq_puts(m
, ",utf8");
841 if (opts
->unicode_xlate
)
842 seq_puts(m
, ",uni_xlate");
844 seq_puts(m
, ",nonumtail");
851 Opt_check_n
, Opt_check_r
, Opt_check_s
, Opt_uid
, Opt_gid
,
852 Opt_umask
, Opt_dmask
, Opt_fmask
, Opt_codepage
, Opt_nocase
,
853 Opt_quiet
, Opt_showexec
, Opt_debug
, Opt_immutable
,
854 Opt_dots
, Opt_nodots
,
855 Opt_charset
, Opt_shortname_lower
, Opt_shortname_win95
,
856 Opt_shortname_winnt
, Opt_shortname_mixed
, Opt_utf8_no
, Opt_utf8_yes
,
857 Opt_uni_xl_no
, Opt_uni_xl_yes
, Opt_nonumtail_no
, Opt_nonumtail_yes
,
858 Opt_obsolate
, Opt_flush
, Opt_err
,
861 static match_table_t fat_tokens
= {
862 {Opt_check_r
, "check=relaxed"},
863 {Opt_check_s
, "check=strict"},
864 {Opt_check_n
, "check=normal"},
865 {Opt_check_r
, "check=r"},
866 {Opt_check_s
, "check=s"},
867 {Opt_check_n
, "check=n"},
870 {Opt_umask
, "umask=%o"},
871 {Opt_dmask
, "dmask=%o"},
872 {Opt_fmask
, "fmask=%o"},
873 {Opt_codepage
, "codepage=%u"},
874 {Opt_nocase
, "nocase"},
875 {Opt_quiet
, "quiet"},
876 {Opt_showexec
, "showexec"},
877 {Opt_debug
, "debug"},
878 {Opt_immutable
, "sys_immutable"},
879 {Opt_obsolate
, "conv=binary"},
880 {Opt_obsolate
, "conv=text"},
881 {Opt_obsolate
, "conv=auto"},
882 {Opt_obsolate
, "conv=b"},
883 {Opt_obsolate
, "conv=t"},
884 {Opt_obsolate
, "conv=a"},
885 {Opt_obsolate
, "fat=%u"},
886 {Opt_obsolate
, "blocksize=%u"},
887 {Opt_obsolate
, "cvf_format=%20s"},
888 {Opt_obsolate
, "cvf_options=%100s"},
889 {Opt_obsolate
, "posix"},
890 {Opt_flush
, "flush"},
893 static match_table_t msdos_tokens
= {
894 {Opt_nodots
, "nodots"},
895 {Opt_nodots
, "dotsOK=no"},
897 {Opt_dots
, "dotsOK=yes"},
900 static match_table_t vfat_tokens
= {
901 {Opt_charset
, "iocharset=%s"},
902 {Opt_shortname_lower
, "shortname=lower"},
903 {Opt_shortname_win95
, "shortname=win95"},
904 {Opt_shortname_winnt
, "shortname=winnt"},
905 {Opt_shortname_mixed
, "shortname=mixed"},
906 {Opt_utf8_no
, "utf8=0"}, /* 0 or no or false */
907 {Opt_utf8_no
, "utf8=no"},
908 {Opt_utf8_no
, "utf8=false"},
909 {Opt_utf8_yes
, "utf8=1"}, /* empty or 1 or yes or true */
910 {Opt_utf8_yes
, "utf8=yes"},
911 {Opt_utf8_yes
, "utf8=true"},
912 {Opt_utf8_yes
, "utf8"},
913 {Opt_uni_xl_no
, "uni_xlate=0"}, /* 0 or no or false */
914 {Opt_uni_xl_no
, "uni_xlate=no"},
915 {Opt_uni_xl_no
, "uni_xlate=false"},
916 {Opt_uni_xl_yes
, "uni_xlate=1"}, /* empty or 1 or yes or true */
917 {Opt_uni_xl_yes
, "uni_xlate=yes"},
918 {Opt_uni_xl_yes
, "uni_xlate=true"},
919 {Opt_uni_xl_yes
, "uni_xlate"},
920 {Opt_nonumtail_no
, "nonumtail=0"}, /* 0 or no or false */
921 {Opt_nonumtail_no
, "nonumtail=no"},
922 {Opt_nonumtail_no
, "nonumtail=false"},
923 {Opt_nonumtail_yes
, "nonumtail=1"}, /* empty or 1 or yes or true */
924 {Opt_nonumtail_yes
, "nonumtail=yes"},
925 {Opt_nonumtail_yes
, "nonumtail=true"},
926 {Opt_nonumtail_yes
, "nonumtail"},
930 static int parse_options(char *options
, int is_vfat
, int silent
, int *debug
,
931 struct fat_mount_options
*opts
)
934 substring_t args
[MAX_OPT_ARGS
];
938 opts
->isvfat
= is_vfat
;
940 opts
->fs_uid
= current
->uid
;
941 opts
->fs_gid
= current
->gid
;
942 opts
->fs_fmask
= opts
->fs_dmask
= current
->fs
->umask
;
943 opts
->codepage
= fat_default_codepage
;
944 opts
->iocharset
= fat_default_iocharset
;
946 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
|VFAT_SFN_CREATE_WIN95
;
949 opts
->name_check
= 'n';
950 opts
->quiet
= opts
->showexec
= opts
->sys_immutable
= opts
->dotsOK
= 0;
951 opts
->utf8
= opts
->unicode_xlate
= 0;
959 while ((p
= strsep(&options
, ",")) != NULL
) {
964 token
= match_token(p
, fat_tokens
, args
);
965 if (token
== Opt_err
) {
967 token
= match_token(p
, vfat_tokens
, args
);
969 token
= match_token(p
, msdos_tokens
, args
);
973 opts
->name_check
= 's';
976 opts
->name_check
= 'r';
979 opts
->name_check
= 'n';
985 /* for backward compatibility */
986 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
987 | VFAT_SFN_CREATE_WIN95
;
1000 opts
->sys_immutable
= 1;
1003 if (match_int(&args
[0], &option
))
1005 opts
->fs_uid
= option
;
1008 if (match_int(&args
[0], &option
))
1010 opts
->fs_gid
= option
;
1013 if (match_octal(&args
[0], &option
))
1015 opts
->fs_fmask
= opts
->fs_dmask
= option
;
1018 if (match_octal(&args
[0], &option
))
1020 opts
->fs_dmask
= option
;
1023 if (match_octal(&args
[0], &option
))
1025 opts
->fs_fmask
= option
;
1028 if (match_int(&args
[0], &option
))
1030 opts
->codepage
= option
;
1036 /* msdos specific */
1046 if (opts
->iocharset
!= fat_default_iocharset
)
1047 kfree(opts
->iocharset
);
1048 iocharset
= match_strdup(&args
[0]);
1051 opts
->iocharset
= iocharset
;
1053 case Opt_shortname_lower
:
1054 opts
->shortname
= VFAT_SFN_DISPLAY_LOWER
1055 | VFAT_SFN_CREATE_WIN95
;
1057 case Opt_shortname_win95
:
1058 opts
->shortname
= VFAT_SFN_DISPLAY_WIN95
1059 | VFAT_SFN_CREATE_WIN95
;
1061 case Opt_shortname_winnt
:
1062 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1063 | VFAT_SFN_CREATE_WINNT
;
1065 case Opt_shortname_mixed
:
1066 opts
->shortname
= VFAT_SFN_DISPLAY_WINNT
1067 | VFAT_SFN_CREATE_WIN95
;
1069 case Opt_utf8_no
: /* 0 or no or false */
1072 case Opt_utf8_yes
: /* empty or 1 or yes or true */
1075 case Opt_uni_xl_no
: /* 0 or no or false */
1076 opts
->unicode_xlate
= 0;
1078 case Opt_uni_xl_yes
: /* empty or 1 or yes or true */
1079 opts
->unicode_xlate
= 1;
1081 case Opt_nonumtail_no
: /* 0 or no or false */
1082 opts
->numtail
= 1; /* negated option */
1084 case Opt_nonumtail_yes
: /* empty or 1 or yes or true */
1085 opts
->numtail
= 0; /* negated option */
1088 /* obsolete mount options */
1090 printk(KERN_INFO
"FAT: \"%s\" option is obsolete, "
1091 "not supported now\n", p
);
1093 /* unknown option */
1097 "FAT: Unrecognized mount option \"%s\" "
1098 "or missing value\n", p
);
1103 /* UTF-8 doesn't provide FAT semantics */
1104 if (!strcmp(opts
->iocharset
, "utf8")) {
1105 printk(KERN_ERR
"FAT: utf8 is not a recommended IO charset"
1106 " for FAT filesystems, filesystem will be case sensitive!\n");
1109 if (opts
->unicode_xlate
)
1115 static int fat_read_root(struct inode
*inode
)
1117 struct super_block
*sb
= inode
->i_sb
;
1118 struct msdos_sb_info
*sbi
= MSDOS_SB(sb
);
1121 MSDOS_I(inode
)->i_pos
= 0;
1122 inode
->i_uid
= sbi
->options
.fs_uid
;
1123 inode
->i_gid
= sbi
->options
.fs_gid
;
1125 inode
->i_generation
= 0;
1126 inode
->i_mode
= (S_IRWXUGO
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
1127 inode
->i_op
= sbi
->dir_ops
;
1128 inode
->i_fop
= &fat_dir_operations
;
1129 if (sbi
->fat_bits
== 32) {
1130 MSDOS_I(inode
)->i_start
= sbi
->root_cluster
;
1131 error
= fat_calc_dir_size(inode
);
1135 MSDOS_I(inode
)->i_start
= 0;
1136 inode
->i_size
= sbi
->dir_entries
* sizeof(struct msdos_dir_entry
);
1138 inode
->i_blocks
= ((inode
->i_size
+ (sbi
->cluster_size
- 1))
1139 & ~((loff_t
)sbi
->cluster_size
- 1)) >> 9;
1140 MSDOS_I(inode
)->i_logstart
= 0;
1141 MSDOS_I(inode
)->mmu_private
= inode
->i_size
;
1143 MSDOS_I(inode
)->i_attrs
= ATTR_NONE
;
1144 inode
->i_mtime
.tv_sec
= inode
->i_atime
.tv_sec
= inode
->i_ctime
.tv_sec
= 0;
1145 inode
->i_mtime
.tv_nsec
= inode
->i_atime
.tv_nsec
= inode
->i_ctime
.tv_nsec
= 0;
1146 inode
->i_nlink
= fat_subdirs(inode
)+2;
1152 * Read the super block of an MS-DOS FS.
1154 int fat_fill_super(struct super_block
*sb
, void *data
, int silent
,
1155 const struct inode_operations
*fs_dir_inode_ops
, int isvfat
)
1157 struct inode
*root_inode
= NULL
;
1158 struct buffer_head
*bh
;
1159 struct fat_boot_sector
*b
;
1160 struct msdos_sb_info
*sbi
;
1161 u16 logical_sector_size
;
1162 u32 total_sectors
, total_clusters
, fat_clusters
, rootdir_sectors
;
1168 sbi
= kzalloc(sizeof(struct msdos_sb_info
), GFP_KERNEL
);
1171 sb
->s_fs_info
= sbi
;
1173 sb
->s_flags
|= MS_NODIRATIME
;
1174 sb
->s_magic
= MSDOS_SUPER_MAGIC
;
1175 sb
->s_op
= &fat_sops
;
1176 sb
->s_export_op
= &fat_export_ops
;
1177 sbi
->dir_ops
= fs_dir_inode_ops
;
1179 error
= parse_options(data
, isvfat
, silent
, &debug
, &sbi
->options
);
1184 sb_min_blocksize(sb
, 512);
1185 bh
= sb_bread(sb
, 0);
1187 printk(KERN_ERR
"FAT: unable to read boot sector\n");
1191 b
= (struct fat_boot_sector
*) bh
->b_data
;
1194 printk(KERN_ERR
"FAT: bogus number of reserved sectors\n");
1200 printk(KERN_ERR
"FAT: bogus number of FAT structure\n");
1206 * Earlier we checked here that b->secs_track and b->head are nonzero,
1207 * but it turns out valid FAT filesystems can have zero there.
1211 if (!FAT_VALID_MEDIA(media
)) {
1213 printk(KERN_ERR
"FAT: invalid media value (0x%02x)\n",
1218 logical_sector_size
=
1219 le16_to_cpu(get_unaligned((__le16
*)&b
->sector_size
));
1220 if (!logical_sector_size
1221 || (logical_sector_size
& (logical_sector_size
- 1))
1222 || (logical_sector_size
< 512)
1223 || (PAGE_CACHE_SIZE
< logical_sector_size
)) {
1225 printk(KERN_ERR
"FAT: bogus logical sector size %u\n",
1226 logical_sector_size
);
1230 sbi
->sec_per_clus
= b
->sec_per_clus
;
1231 if (!sbi
->sec_per_clus
1232 || (sbi
->sec_per_clus
& (sbi
->sec_per_clus
- 1))) {
1234 printk(KERN_ERR
"FAT: bogus sectors per cluster %u\n",
1240 if (logical_sector_size
< sb
->s_blocksize
) {
1241 printk(KERN_ERR
"FAT: logical sector size too small for device"
1242 " (logical sector size = %u)\n", logical_sector_size
);
1246 if (logical_sector_size
> sb
->s_blocksize
) {
1249 if (!sb_set_blocksize(sb
, logical_sector_size
)) {
1250 printk(KERN_ERR
"FAT: unable to set blocksize %u\n",
1251 logical_sector_size
);
1254 bh
= sb_bread(sb
, 0);
1256 printk(KERN_ERR
"FAT: unable to read boot sector"
1257 " (logical sector size = %lu)\n",
1261 b
= (struct fat_boot_sector
*) bh
->b_data
;
1264 sbi
->cluster_size
= sb
->s_blocksize
* sbi
->sec_per_clus
;
1265 sbi
->cluster_bits
= ffs(sbi
->cluster_size
) - 1;
1266 sbi
->fats
= b
->fats
;
1267 sbi
->fat_bits
= 0; /* Don't know yet */
1268 sbi
->fat_start
= le16_to_cpu(b
->reserved
);
1269 sbi
->fat_length
= le16_to_cpu(b
->fat_length
);
1270 sbi
->root_cluster
= 0;
1271 sbi
->free_clusters
= -1; /* Don't know yet */
1272 sbi
->prev_free
= FAT_START_ENT
;
1274 if (!sbi
->fat_length
&& b
->fat32_length
) {
1275 struct fat_boot_fsinfo
*fsinfo
;
1276 struct buffer_head
*fsinfo_bh
;
1280 sbi
->fat_length
= le32_to_cpu(b
->fat32_length
);
1281 sbi
->root_cluster
= le32_to_cpu(b
->root_cluster
);
1283 sb
->s_maxbytes
= 0xffffffff;
1285 /* MC - if info_sector is 0, don't multiply by 0 */
1286 sbi
->fsinfo_sector
= le16_to_cpu(b
->info_sector
);
1287 if (sbi
->fsinfo_sector
== 0)
1288 sbi
->fsinfo_sector
= 1;
1290 fsinfo_bh
= sb_bread(sb
, sbi
->fsinfo_sector
);
1291 if (fsinfo_bh
== NULL
) {
1292 printk(KERN_ERR
"FAT: bread failed, FSINFO block"
1293 " (sector = %lu)\n", sbi
->fsinfo_sector
);
1298 fsinfo
= (struct fat_boot_fsinfo
*)fsinfo_bh
->b_data
;
1299 if (!IS_FSINFO(fsinfo
)) {
1301 "FAT: Did not find valid FSINFO signature.\n"
1302 " Found signature1 0x%08x signature2 0x%08x"
1303 " (sector = %lu)\n",
1304 le32_to_cpu(fsinfo
->signature1
),
1305 le32_to_cpu(fsinfo
->signature2
),
1306 sbi
->fsinfo_sector
);
1308 sbi
->free_clusters
= le32_to_cpu(fsinfo
->free_clusters
);
1309 sbi
->prev_free
= le32_to_cpu(fsinfo
->next_cluster
);
1315 sbi
->dir_per_block
= sb
->s_blocksize
/ sizeof(struct msdos_dir_entry
);
1316 sbi
->dir_per_block_bits
= ffs(sbi
->dir_per_block
) - 1;
1318 sbi
->dir_start
= sbi
->fat_start
+ sbi
->fats
* sbi
->fat_length
;
1320 le16_to_cpu(get_unaligned((__le16
*)&b
->dir_entries
));
1321 if (sbi
->dir_entries
& (sbi
->dir_per_block
- 1)) {
1323 printk(KERN_ERR
"FAT: bogus directroy-entries per block"
1324 " (%u)\n", sbi
->dir_entries
);
1329 rootdir_sectors
= sbi
->dir_entries
1330 * sizeof(struct msdos_dir_entry
) / sb
->s_blocksize
;
1331 sbi
->data_start
= sbi
->dir_start
+ rootdir_sectors
;
1332 total_sectors
= le16_to_cpu(get_unaligned((__le16
*)&b
->sectors
));
1333 if (total_sectors
== 0)
1334 total_sectors
= le32_to_cpu(b
->total_sect
);
1336 total_clusters
= (total_sectors
- sbi
->data_start
) / sbi
->sec_per_clus
;
1338 if (sbi
->fat_bits
!= 32)
1339 sbi
->fat_bits
= (total_clusters
> MAX_FAT12
) ? 16 : 12;
1341 /* check that FAT table does not overflow */
1342 fat_clusters
= sbi
->fat_length
* sb
->s_blocksize
* 8 / sbi
->fat_bits
;
1343 total_clusters
= min(total_clusters
, fat_clusters
- FAT_START_ENT
);
1344 if (total_clusters
> MAX_FAT(sb
)) {
1346 printk(KERN_ERR
"FAT: count of clusters too big (%u)\n",
1352 sbi
->max_cluster
= total_clusters
+ FAT_START_ENT
;
1353 /* check the free_clusters, it's not necessarily correct */
1354 if (sbi
->free_clusters
!= -1 && sbi
->free_clusters
> total_clusters
)
1355 sbi
->free_clusters
= -1;
1356 /* check the prev_free, it's not necessarily correct */
1357 sbi
->prev_free
%= sbi
->max_cluster
;
1358 if (sbi
->prev_free
< FAT_START_ENT
)
1359 sbi
->prev_free
= FAT_START_ENT
;
1363 /* set up enough so that it can read an inode */
1365 fat_ent_access_init(sb
);
1368 * The low byte of FAT's first entry must have same value with
1369 * media-field. But in real world, too many devices is
1370 * writing wrong value. So, removed that validity check.
1372 * if (FAT_FIRST_ENT(sb, media) != first)
1376 sprintf(buf
, "cp%d", sbi
->options
.codepage
);
1377 sbi
->nls_disk
= load_nls(buf
);
1378 if (!sbi
->nls_disk
) {
1379 printk(KERN_ERR
"FAT: codepage %s not found\n", buf
);
1383 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1384 if (sbi
->options
.isvfat
) {
1385 sbi
->nls_io
= load_nls(sbi
->options
.iocharset
);
1387 printk(KERN_ERR
"FAT: IO charset %s not found\n",
1388 sbi
->options
.iocharset
);
1394 root_inode
= new_inode(sb
);
1397 root_inode
->i_ino
= MSDOS_ROOT_INO
;
1398 root_inode
->i_version
= 1;
1399 error
= fat_read_root(root_inode
);
1403 insert_inode_hash(root_inode
);
1404 sb
->s_root
= d_alloc_root(root_inode
);
1406 printk(KERN_ERR
"FAT: get root inode failed\n");
1415 printk(KERN_INFO
"VFS: Can't find a valid FAT filesystem"
1416 " on dev %s.\n", sb
->s_id
);
1422 unload_nls(sbi
->nls_io
);
1424 unload_nls(sbi
->nls_disk
);
1425 if (sbi
->options
.iocharset
!= fat_default_iocharset
)
1426 kfree(sbi
->options
.iocharset
);
1427 sb
->s_fs_info
= NULL
;
1432 EXPORT_SYMBOL_GPL(fat_fill_super
);
1435 * helper function for fat_flush_inodes. This writes both the inode
1436 * and the file data blocks, waiting for in flight data blocks before
1437 * the start of the call. It does not wait for any io started
1440 static int writeback_inode(struct inode
*inode
)
1444 struct address_space
*mapping
= inode
->i_mapping
;
1445 struct writeback_control wbc
= {
1446 .sync_mode
= WB_SYNC_NONE
,
1449 /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
1450 * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
1451 * and filemap_fdatawrite is used for the data blocks
1453 ret
= sync_inode(inode
, &wbc
);
1455 ret
= filemap_fdatawrite(mapping
);
1460 * write data and metadata corresponding to i1 and i2. The io is
1461 * started but we do not wait for any of it to finish.
1463 * filemap_flush is used for the block device, so if there is a dirty
1464 * page for a block already in flight, we will not wait and start the
1467 int fat_flush_inodes(struct super_block
*sb
, struct inode
*i1
, struct inode
*i2
)
1470 if (!MSDOS_SB(sb
)->options
.flush
)
1473 ret
= writeback_inode(i1
);
1475 ret
= writeback_inode(i2
);
1477 struct address_space
*mapping
= sb
->s_bdev
->bd_inode
->i_mapping
;
1478 ret
= filemap_flush(mapping
);
1482 EXPORT_SYMBOL_GPL(fat_flush_inodes
);
1484 static int __init
init_fat_fs(void)
1488 err
= fat_cache_init();
1492 err
= fat_init_inodecache();
1499 fat_cache_destroy();
1503 static void __exit
exit_fat_fs(void)
1505 fat_cache_destroy();
1506 fat_destroy_inodecache();
1509 module_init(init_fat_fs
)
1510 module_exit(exit_fat_fs
)
1512 MODULE_LICENSE("GPL");